There is no workaround is needed as long as you only have SOLID elements in your simulation it is possible to export the deformed shape at the last time step of your nonlinear dynamics. See the images below:

In fact, I just proved that the deformed shape is possible to be obtained in NL Dyn simulation. Besides, as I said it is only available if you yous SOLID elements. Having said that, only tow workarounds comes to my mind: 1) use SOLID element 2) take a screen shot of the deformed shape, then import it back to SW, scale it, and try to match it with some splines which for sure would not be an accurate approach.